As lesions expand, they can coalesce to form large, brown areas of leaf blight. What to look for 10/11/2020 2:54 PM. Rust may defoliate the shrub in severe cases. CONTEXT: Blueberry Rust, a . (Powdery mildew spots are similar in appearance but penetrate through the leaf and are caused by a fungus.) needs to be present for the disease cycle to be completed. Over time, and if not properly managed, bushes slowly decline and produce fewer marketable berries. Blueberry Leaf Rust Melanie L. Lewis Ivey, Assistant Professor, Department of Plant Pathology, The Ohio State University-Ohio Agricultural Research and Development Center, Wooster, OH . Topside of infected blueberry leaves on left showing brown... Damage. Leaf rust is caused by the fungus Pucciniastrum vaccinii. my sunshine blue blueberry plant has leaf rust, and i checked the undersides of the leaves and its worse than i thought. Rust is a common disease of calendulas, roses, snapdragons, geraniums, gerberas and beans. Different rust fungi attack different host plants so rust on gerananiums won’t spread to other types of plants. Based on feedback from growers, the Department has undertaken a scientific assessment of potential treatments of blueberry rust to identify if any treatments were currently available that might enable eradication of the disease to be attempted based on the Tasmanian situation.. blueberry rust in Tasmania. Initial small yellow, chlorotic leaf spots on upper surface of young leaves Put into search the name of the fungus + Actinovate. Blueberry rust has been present in parts of NSW and Queensland for many years. The advice from NSW DPI was that they would not recommend defoliation on a commercial scale as it had no technical basis as a response technique. This disease of blueberries is not found in Western Australiaand will be a nuisance for home gardeners and farmers if it is introduced. After a while, The pustules change their color and become black. Blueberry rust (Thekopsora minima) is a serious disease of blueberries that causes extensive defoliation and may cause plant death on plants with severe infections. Occasionally, epidemics occur on highbush blueberry, especially in the states on the East Coast of the United States. Blueberry rust can be managed with fungicides or by planting tolerant varieties. The two most common leaf spot diseases are anthracnose and septoria. Blueberry Leaf Rust: PLPATH-FRU-43 : blueberry, blueberry rust, blueberry leaf rust, pucciniastrum vaccinia: Search form. A commercial grower notified Biosecurity Tasmania of the suspect plants earlier this week and testing by DPIPWE’s Plant Health Laboratories has confirmed the disease in six of 11 samples from the site. Jul 19, 2018 - Michigan State University Extension helps people improve their lives by bringing the vast knowledge resources of MSU directly to individuals, communities and businesses. Also, help answer other questions about General Gardening and Blueberry Bushes, and plants at GardeningKnowHow.com Immature stages. “Spots later turn reddish brown and may be surrounded by a slight yellow halo. brown patch fungus + Actinovate. The disease has been reported in Asia, Argentina, Australia, Canada, Europe, Mexico and the United States. Search . Help answer a question about blueberry leaf rust - Gardening Know How Questions & Answers. “Blueberry leaf rust first appears as tiny yellow spots on the upper surface of young blueberry leaves about 10 days after inoculation,” writes Nelson in a 2008 plant disease report. How should I treat it (if at all) and when? Disease Development and Symptoms Mild temperatures (65 -68 degrees F) and multiple days of rain are conducive to infection and disease development. Best printed in Google Chrome. Blueberry rust. Symptoms on the upper surfaces of leaves appear as small, yellow spots that later turn necrotic as they enlarge and coalesce and eventually cover large areas of individual leaves. Rainy periods in the middle of the growing season are conducive to disease development. It shows up as a scattering of orange, yellow or red spots on foliage. With the moist fall conditions we have been having, don’t be surprised if you see some on your blueberries. View the Ohio State University Factsheet on Bluberry Leaf Rust . Blueberry rust is a plant disease caused by a fungus called Thekopsora minima. Blueberry rust is a fungal pathogen and is classified under Tasmania's
Leaf rust produced by Pucciniastrum myrtilli. The loss of leaves reduces plant vigour, leading to a decline in yield and a reduction in flowers the following season. July 26, 2010 – Be on the look-out for blueberry leaf rust, particularly in fields that have had a problem in previous years. The containment strategy has seen a recent drop in the number of infected premises from seven to four with no new crop infections since December 2018. Undersides of leaves show yellow or orange pustules of spores. Based on those assessments, the Department will continue to implement the regulated containment strategy and working with growers to enable ongoing market access. Occurrence of blueberry rust can therefore restrict market access to some states. Leaf rust produced by Pucciniastrum myrtilli The first symptoms of this disease are represented by the appearance of some chlorotic spots on the upper side of the leaves. On the underside of leaves, yellow pustules of powdery fungal spores develop (Figure 1). Blueberry rust has been present in NSW for many years and there are currently no import conditions or restrictions applied to the movement of host plants in NSW. Blueberry leaf rust. This page was created by the Department of Primary Industries, Parks, Water and Environment (Tasmania). Market access for the 2020/2021 season has been successfully negotiated for those businesses wanting to export to Victoria, South Australia and Western Australia under specific trade protocols and arrangements. Subsequent to this detection two additional Rust fungus grows within the leaf so there is usually a copy of the spores on the underside of the leaf as well. Search . Farm biosecurity is a shared responsibility, and that of every person visiting or working on your property. Spots later turn reddish Blueberry rust was detected in the Melbourne metropolitan area towards the end of 2014. The entire leaf may die if numerous spots coalesce and become necrotic. UH–CTAHR Blueberry Rust PD-51 — Oct. 2008 There may be significant anthocyanescence (reddening) of affected leaves. Plant Quarantine Act 1997 as a List A disease. This means that growers can continue to access interstate markets. List A fungal disease of blueberry plants and re lated hosts was detected on a large commercial blueberry farm in north -west Tasmania in August 2016. Leaf rust, as the name implies, is confined to the leaves of susceptible blueberry varieties, most notably, early maturing 'Sharpeblue', which comprises about 95% of Florida's highbush plantings. Fungal rust diseases, such as from the causal pathogen, Pucciniastrum vaccinii, may cause leaf spots that first appear yellow and then turn reddish-brown on the tops of the leaves and yellowish-brown on the undersides of leaves. Help answer a question about blueberry leaf rust - Gardening Know How Questions & Answers. These pustules turn rusty red with age. Blueberry rust infected blueberry leaves. Leaf rust, as the name implies, is confined to the leaves of susceptible blueberry varieties, most notably, early maturing 'Sharpeblue', which comprises about 95% of Florida's highbush plantings. Regarding leaf rollers, several types of leaf rollers and leaf tiers attack blueberries. Prematurely fallen leaves at a nursery due to blueberry rust. Last published on:
Florida Blueberry Leaf Disease Guide 4 Rust In Florida, this disease is caused by Naohidemyces vaccinii (formerly Pucciniastrum vaccinii). feedback form or by telephone. Disease symptoms. Leaf rust symptoms have been noticed sporadically on northern highbush blueberry plants (Vaccinium corymbosum L.) in Michigan for the past 8 years. The disease evolves, and on the lower side will appear orange pustules. Mature leaf spots on a lower leaf surface have developed distinct, brown margins. Blueberry rust has been reported in Europe, Argentina, Asia, Mexico, Canada, the United States and Australia. Blighted blossoms are retained through the summer but fail to develop into fruit. Put in place biosecurity best practice actions to prevent entry, establishment and spread of blueberry rust onto your property: Fishing closures, restrictions and permits, Volunteer non-commercial kangaroo shooting, NSW Hunting Stakeholder Consultation Group, Zoonoses - Animal diseases that can infect people, Forest contractor training and certification scheme, Potato cyst nematodes pest information and biosecurity, ensure all staff and visitors are instructed in and adhere to your business management hygiene requirements, source plant material of a known high health status from reputable suppliers. The disease evolves, and on the lower side will appear orange pustules. Susan Mené . Best printed in Google Chrome. The disease is caused by the fungus Pucciniastrum vaccinii, and it can attack all Vaccinium species. Cultural control . Rust pustules on the underside of infected leaves can be seen roughly 10 days after initial spore contact. These are the most common diseases that blueberries contract: Fungal Fruit Rots. The scientific assessment by TIA concluded that the rust pathogen could not be eradicated from the State. In glasshouse environments, spores can be carried by people, on clothing for example, when walking past and contacting plants. There are no import requirements for blueberry rust host produce for the New South Wales and Queensland markets. In 2009, leaf rust was seen in several cultivated blueberry fields and on greenhouse-grown blueberry plants in southwest Michigan. You may then either print the fact sheet or save it as a PDF.
It's very important that you not disturb or move the plant. The disease first appears as yellow (chlorotic) leaf spots on the upper leaf surface of new blueberry leaves. In 2009, leaf rust was seen in several cultivated blueberry fields and on greenhouse-grown blueberry plants in southwest Michigan. Can I still use the berries? First Report of Leaf Rust of Blueberry Caused by Thekopsora minima on Vaccinium corymbosum in the Western Cape, South Africa Data provider: Information Systems Division, National Agricultural Library. Burn blueberry plant and leaf debris infected with red ringspot virus, which creates reddish brown spots with a green center on leaf surfaces in late summer and fall. Adopt a range of farm biosecurity measures that will assist in protecting your property from the entry and spread of pests and diseases. Posts: 75. Blueberry Leaf Rust. Spores released from the pustules further infect blueberry leaves in a repetitive cycle. Infection levels at the time were assessed to be low to moderate. The best way to manage blueberry leaf rust is to plant resistant varieties. Both are typically observed in spring when a blossom blight occurs. Key Points. Leaf tiers tie the leaves by attaching filaments to … We recommend Copper Hydroxide (product names include Kocide or Blueshield). The eggs of blueberry leaftiers are approximately 0.6 mm in diameter and oval in shape. To print a fact sheet, use the "Print" command in your browser. What is blueberry rust? In Massachusetts, spores are released from March to mid-July, and new infections can occur throughout the growing season. Blueberry rust (Thekopsora minima) is a serious disease of blueberries that causes extensive defoliation and may cause plant death on plants with severe infections.Blueberry rust is a fungal pathogen and is classified under Tasmania's Plant Quarantine Act 1997 as a List A disease. Strict quarantine measures on infected properties; Regular inspections of infected properties to ensure compliance with quarantine requirements; Ongoing surveillance of properties to provide confirmation of properties free of disease; and. Infected leaves may curl and in severe cases the entire leaf will eventually die as the spots merge and become necrotic. For detailed information, together with a range of farm biosecurity resources that will assist in protecting your property – and livelihood – visit the
Leaf Rust of Blueberry ... Photo courtesy of NCSU Cooperative Extension Service. Rust spores are spread efficiently by wind. This was the first instance of the disease occurring in Victoria. 'De- light', a top yielding rabbiteye variety in Texas, produces poorly under Florida conditions, probably due to premature defoliation caused by a complex of foliage diseases including leaf rust. The rust’s alternate host, hemlock (Tsuga sp.) Later in the season similar disease pustules may also appear on developing fruit (Figure 2). Remove hemlocks upwind from where blueberry is grown. he suspect blueberries were recently reported to Biosecurity Tasmania by a member of the public and confirmed through diagnostic processes. Blueberry scorch and Sheep Pen Hill disease (SPHD) are commonly found occurring on the West Coast and in New Jersey, respectively. (89Kb), Review of the DPIPWE Response to 2016 Blueberry Rust Detection (331Kb). After a while, The pustules change their color and become black. As the disease progresses, the leaves begin to die and fall off. The removal of alternative or volunteer host plants that may harbour the disease can be beneficial in reducing sources of blueberry rust spores. Scientific advice prepared by TIA on blueberry rust in Tasmania
Susan Mené ... That shouldn't harm the berries, to treat the leaf rust you can use an aerated compost tea to spray over the whole plant and the surrounding soil. When the moths’ wings are folded the main colour that can be seen is rust red-brown bordered by yellow margins. Blueberry rust is not reportable in NSW, however, quarantine boundaries and procedures have been established to prevent the spread of blueberry rust from known infested areas to other states currently free of the disease. Tasmanians are asked to be vigilant for signs of blueberry rust following the detection of blueberry rust spores on imported blueberries bought in southern Tasmania. Leaf rust of blueberry in Florida is caused by the fungus Pucciniastrum vaccinii . Published on October 21, 2016 October 31, 2016 by Lyssa Seefeldt. Spots on blueberry leaves are usually caused by a fungus, and some can ruin an entire crop. New infections occur following rains when tender new tissue is present … The fungus has a wide host range including species of Vaccinium spp. Severe cases of blueberry rust can lead to premature leaf drop. Following confirmation of blueberry rust, Biosecurity Tasmania has acted quickly to follow up on the detection and is working closely with the retail outlet to remove any further affected blueberries. Eggs of these pests are laid by night flying moths onto the leaves or fruit. While there may be some signs of disease on flowers, stems or even fruit, the primarily affected part is the leaf. Leaf rust symptoms have been noticed sporadically on northern highbush blueberry plants (Vaccinium corymbosum L.) in Michigan for the past 8 years. On the lower leaf surface, yellow to orange spore pustules (uredia) are present, which may turn rusty red with age (Photo 2). To print a fact sheet, use the "Print" command in your browser. More blueberry virus information. Rust on plant tissues Red-brown lesions on upper leaf surface Yellow-orange pustules on underside of leaf Retained leaves are main source of inoculum Pustules on fruit Epidemiology • Blueberry rust spore germination and infection are favoured by: Ø Prolonged leaf moisture Ø Temperatures between 15-25oC Ø Susceptible host tissue What to look for. The assessment involved consulting with the Tasmanian Institute of Agriculture (TIA), the NSW Department of Primary Industries (NSW DPI) as well as Biosecurity Tasmania plant health specialists. Survey results have also suggested that the amount of rust on-site at one infected premises has steadily decreased over time due to the treatment program in place as part of their site management plan. Losses from this disease can be serious. Do not wait for leaf damage to occur before spraying, as protection is better than cure. https://www.agric.wa.gov.au/plant-biosecurity/blueberry-rust-declared-pest Rust on azalea. Leaf rust is usually of minor importance being a problem on lowbush, rabbiteye, southern highbush or ornamental blueberries that do not shed leaves in the winter. About 10 days after a young blueberry leaf is inoculated with urediniospores, the disease appears as tiny, chlorotic (yellow) spots on the upper leaf surface. Airborne spores (aeciospores) infect newly expanded blueberry leaves in the spring. High humidity and prolonged leaf wetness encourage these pathogens. Blueberry rust was also detected in Tasmania towards the end of 2014, with all infected plants subsequently destroyed under Tasmania’s biosecurity protocols. Of the six rusts in North America, the hemlock-blueberry rust, Puccininastrum vaccinii, is the most common rust infecting deciduous azaleas in Maryland. “Blueberry leaf rust first appears as tiny yellow spots on the upper surface of young blueberry leaves about 10 days after inoculation,” writes Nelson in a 2008 plant disease report. Blueberry spot characteristics are as varied as the diseases that cause them. Limiting overhead irrigation can reduce leaf wetness to minimise the spread of rust spores in water runoff. On the underside of the leaf, opposite upper leaf symptoms, yellowish-orange pustules (uredinia) develop that turn rusty-red with age. These are the major fungal fruit rots of blueberries and their symptoms. This is a pocket-sized guide for reference in blueberry fields and can be purchased from MSU Extension at shop.msu.edu (Publication E-2928).. Resources New pustules are generally produced every 10–14 days, though this can occur more rapidly under favourable conditions. Photo: Bruce Watt, Bugwood.org. Also, help answer other questions about General Gardening and Blueberry Bushes, and plants at GardeningKnowHow.com They hatch into caterpillars that roll up the leaves and feed inside. This means that the chances of the rust spreading from that property has greatly decreased. Such … Funding has been made available to Fruit Growers Tasmania (FGT) to Implement the program, which is targeted to blueberry growers. The initial symptoms of blueberry rust usually appear midseason on the leaves of host plants. The majority of Australian states are free of blueberry rust and some regulate against host products. The following plants are considered hosts of blueberry rust in Australia and have associated movement restrictions in some states: Blueberry rust spores are very easily and quickly spread to nearby plants by wind and rain. The Department and Fruit Growers Tasmania are working together to deliver a Farm Hygiene Program for berry growers. Farm Biosecurity Program website (the Program is a joint initiative of Animal Health Australia (AHA) and Plant Health Australia (PHA)). Infected leaves usually drop prematurely. 9. Leaf rust is usually of minor importance; however, epidemics have been reported on lowbush blueberry, where the disease contributes to the leaf spot complex. Severe cases of blueberry rust can lead to premature leaf drop. If you SEE something unusual in blueberries that you purchase, such as yellow-orange pustules on the fruit: SECURE and REPORT. Care should also be taken to ensure that any clothes or equipment do not become contaminated. The body and head are also yellow in colour and two small yellow spots can be seen in the centre of the rust coloured patch (Figure 1). Yellow spots appear on leaves by mid-season and eventually turn reddish-brown (Photo 1). Deciduous azaleas are the primary group of broadleaved shrubs damaged by rust. Containment is a recognised response to pest and disease incursions that focusses on limiting movement of the disease and putting in place the requirements to enable ongoing market access. In mild climates such as Australia's, blueberry rust survives over winter by persisting on host leaves that remain evergreen. The information presented here about diseases was developed from the publication A Pocket Guide to IPM Scouting in Highbush Blueberries by Annemiek Schilder, Rufus Isaacs, Eric Hanson and Bill Cline. In early spring to summer, spores from hemlocks (alternate host) are dispersed by wind and infect young blueberry leaves. Applications for the program are still open. Leaf rust, a disease causing extensive defoliation on plants with severe infections, was observed in the autumn of 2007 and it has become one of the most significant diseases of blueberry in these states. Spores (urediniospores) released from rust pustules (uredinia) formed in mid-season on blueberry lower leaf surface... Telia … You should, as soon as possible, phone Biosecurity Tasmania on (03) 6165 3777 or the plant disease hotline on 1800 084 881 and report the symptoms noticeable on the plant. Removing affected leaves, drier conditions, soil adjustment, or chemical sprays can resolve the problem. Blueberry Leaf Rust Rainy weather can provide a hospitable environment for leaf rust, a fungal disease that causes yellow spots that eventually turn rusty red. Spots will multiply and the leaves will eventually yellow and fall off. Questions concerning its content can be sent using the
Blueberry Leaf Rust: Is a minor disease of blueberries caused by the rust fungus, Pucciniastrum vaccinia. Blueberry rust can be spread over longer distances by people transporting infected plants, fruit, packaging, equipment and clothing. Disease Cycle. Soil remains well drained. Blueberry Leaf Rust: PLPATH-FRU-43 : blueberry, blueberry rust, blueberry leaf rust, pucciniastrum vaccinia: Search form. Cause Thekopsora minima and Naohidemyces vaccinii (both formerly Pucciniastrum vaccinii), fungi. Severe blueberry rust infection may lead to the death of susceptible plants. Adult Adult blueberry leaftier moths are about 6 mm long with a wingspan 14–16 mm. Blueberry rust is a fungal pathogen and is classified under Tasmania's Plant Quarantine Act 1997 as a List A disease. Blueberry rust (Thekopsora minima) is a fungal disease which infects the leaves and fruit of blueberries and related plants in the Ericaceae plant family. Blueberry Leaf Rust (2016) Leaf rust can cause premature defoliation of affected bushes. It appears that a branch on one is dead - all brown. (410Kb), State-wide surveys will continue each season. Figure 3. Spread of the disease has currently been contained, though the Victorian government is remaining vigilant for any further detection. Small yellow spots develop on the upper surface of leaves. Do a search for blueberry rust fungus + Actinovate and the information you seek will pop up on the top posts. Blueberry rust (Thekopsora minima) is a serious disease of blueberries that causes extensive defoliation and may cause plant death on plants with severe infections. The pathogen must have a living host to survive. In central Florida, the fungus survives mild winters on evergreen plants of Vaccinium species, in the environment surrounding production fields, or in blueberry plants in protected culture (such as high-tunnel production). I like... posted 1 year ago. Blueberry rust is present in low levels in Tasmania and a local containment strategy is in place to reduce the risk of movement of the disease, together with strict biosecurity import requirements to help reduce the risk of blueberry rust entering the state. When the moths’ wings are folded the main colour that can be seen is rust red-brown bordered by yellow margins. What: Leaf rust is caused by the fungus, Naohidemyces vaccinii, formerly known as Pucciniastrum vaccinii. Blueberry leaf rust . The aim of this program is to assist small growers, in particular, to adapt operations and protect their farms from a range of pests and diseases and to support them in management for market access requirements. Initial small yellow, chlorotic leaf spots on upper surface of young leaves, Lesions turn rust/brown coloured and enlarge as the infection progresses (, Yellow-orange powdery pustules develop on the underside of leaves (, Similar pustules may also appear on blueberry fruit (, Ensure you and your staff are aware of plant diseases, and are familiar with symptoms, Disease identification information should be on-site and be easily accessible to all staff and visitors, Limit the access of people (visitors and staff) onto your property, Disinfect all equipment/vehicles that move off-site and return to operate on the property, Implement a hygiene protocol for essential visitors (contractors, suppliers, etc), Restrict all non-business vehicles from entry onto the property, Minimise or allocate specific staff who might come in contact with host material, Source plant material from known professional growers with good accreditation, Inspect imported blueberry host material prior to introduction to your property. Fruit Growers Tasmania Tel (03) 6169 2059 firstname.lastname@example.org, Plant BiosecurityPhone: 03 6165 3777 or 1800 084 881 (for biosecurity service in your State)Email: Biosecurity.Tasmania@dpipwe.tas.gov.au. (128Kb), Advice from NSW DPI - defoliation and blueberry rust
Leaf rust of blueberry in Florida is caused by the fungus Pucciniastrum vaccinii. The lower leaf surface gathers a yellowish-orange dust, which is associated with the leaf spots. Leaf rut symptoms have been noticed sporadically on nothern highbrush blueberry plants (Vaccinium corymbosum) in Michigan (USA) for the past 8 years. Spores are disseminated by rainwater. The fungus destroys blueberry leaves, reducing photosynthesis which is necessary for plant growth and development. Apply a good fungicide for protection. Fungicides used to treat Blueberry Diseases: Leafspots: Botrytis Blight: Mummy Berry : benomyl: benomyl, captan: benomyl, captan, triforine: 2 Responses to Blueberry. The first symptoms of this disease are represented by the appearance of some chlorotic spots on the upper side of the leaves. You may then either print the fact sheet or save it as a PDF. The Department will also continue to review relevant scientific information that becomes available that may inform its ongoing approach to the disease. DPIPWE continues to work with industry in efforts to control and contain blueberry rust in Tasmania. Blueberry Rust Fact Sheet Acknowledgements Photos of blueberry fruit: “Fresh blueberries on white background” by Marco Verch on Flickr is licensed under Creative Commons 2.0 Spots/Spores on leaves: “Blueberry rust” by Scot Nelson on Flickr. 1 Good morning all from a novice on a hilly acre! Leaf rust of blueberry is caused by the fungus Pucciniastrum vaccinia (synonym Naohidemyces vaccinia). Bisecurity Tasmania - Blueberry Rust Factsheet
The National Agricultural Library is one of four national libraries of the United States, with locations in Beltsville, Maryland and Washington, D.C. Blueberry leaf rust . Although the common name of the disease is “leaf rust”, the disease can also infect the stems and fruit of blueberry plants. Close up of the underside of this 'Peach Sorbet' blueberry showing rust pustules. These spots later turn reddish brown and may be surrounded by a slight chlorotic halo. its 2 years old and is currently producing its first berries. In the field, the symptoms appear on leaves by mid-season at any growth stage of plants and on fruits by late season. Location: Suffolk County, Long Island NY. Leaf Spot (fungus – Gloeocercospora inconspicua, ... Other diseases: Other diseases that may occur on blueberry are Phytophthora root rot, powdery mildew, crown gall and ripe rot (fruit rot near maturity). If you have blueberry shrubs, you’ll need to learn about what causes blueberry leaf spot diseases and ways to treat them early. Numerous fungal diseases cause leaf spotting including gloeosporium leaf spot (also called anthracnose), septoria leaf spot, rust and powdery mildew. For further information on market access contact (03) 6777 2160 or (03) 6475 4138, Applications for the program are still ope, Agricultural Workforce Resilience Package, Identifying, Selling & Moving Livestock/NLIS, COVID-19 Help for Agricultural Businesses, Traveller's Guide to Tasmanian Biosecurity - What You Can and Can't Bring into Tasmania, Development Planning & Conservation Assessment, Land Information System Tasmania (theLIST), Spatial Discovery - Educational Resources for Schools, Water licence and dam permit applications, Managing Wildlife Browsing & Grazing Losses, Water Information System of Tasmania (WIST), Identifying, Moving and Selling Livestock, Tasmanian Biosecurity Import Requirements Database (TBIRD), Tasmanian Institute of Agriculture (UTAS) - Managing Blueberry Rust, 03 6165 3777 or 1800 084 881 (for biosecurity service in your State). As the infection progresses the spots grow and darken to a rust brown colour (Figure 1), often surrounded by a yellow halo. Leaf rust spots on the underside of a blueberry leaf. For those questioning if Actinovate will control whatever type of fungus problem they have this is the way to find the information quickly. Fusicoccum Canker or Godronia Canker (Godronia cassandrae): Fusicoccum canker is caused by a fungus that infects blueberry stems causing dieback and plant decline. Working with industry to ensure good on farm hygiene at non-infected properties to reduce the risk of infection. Blueberry leaf rust 500–750 mL/ha (202–304 mL/acre) Apply at the first sign of disease in the sprout year. Question from Monty: Blueberries I've had for many years in pots have now developed rust, and one with leaf curl. My modest harvest from my blueberry bushes is imminent, and lo and behold leaf rust is appearing. It also occasionally pops up on blueberry plants in greenhouses. All blueberry varieties are susceptible to fungal leaf diseases (particularly blueberry rust) under high humidity and high rainfall. The alternate host for the rust fungus in this region is hemlock (western or Pacific hemlock, Tsuga heterophylla, and the mountain or black hemlock, T. mertensiana).